Ocean County Average 1999 NATA Modeled Air Concentrations Compared to Health Benchmarks

Pollutant

Modeled
Air Concentration (ug/m3)

Health
Benchmark (ug/m3)

Risk
Ratio

%
Contribution from

Major Sources

Area
Sources

On-road
Mobile Sources

Nonroad
Mobile Sources

Background

Acetaldehyde

1

0.45

2

0.5%

4%

35%

11%

50%

Acrolein

0.07

0.020

4

0.007%

40%

44%

16%

0%

Arsenic Compounds

0.00004

0.00023

0.2

48%

52%

0%

0%

0%

Benzene

1

0.13

8

0.07%

7%

27%

15%

50%

Bis(2-ethylhexyl)phthalate

2

0.42

4

0.03%

0.003%

0%

0%

100%

1,3-Butadiene

0.2

0.033

5

0.0003%

3%

13%

7%

76%

Cadmium Compounds

0.00002

0.00024

0.1

4%

96%

0%

0.07%

0%

Carbon Tetrachloride

0.3

0.067

4

0.0001%

0.1%

0%

0%

100%

Chloroform

0.07

0.043

1.7

0.008%

35%

0%

0%

65%

Chromium (hexavalent form)

0.00002

0.000083

0.2

20%

51%

28%

2%

0%

1,4-Dichlorobenzene

0.03

0.091

0.3

0.1%

100%

0%

0%

0%

1,3-Dichloropropene

0.06

0.25

0.2

0%

100%

0%

0%

0%

Diesel Particulate Matter

1

0.0033

389

0%

0%

45%

55%

*

Ethylene Dibromide

0.05

0.0017

29

0.0004%

0.001%

0%

0%

100%

Ethylene Dichloride

0.06

0.038

1.7

0.07%

0.1%

0%

0%

100%

Ethylene Oxide

0.0009

0.011

0.1

28%

72%

0%

0%

0%

Formaldehyde

2

0.077

21

0.4%

7%

16%

6%

71%

Methyl Chloride

1

0.56

2

0.005%

0.6%

0%

0%

99%

Naphthalene

0.03

0.029

0.9

2%

66%

28%

4%

0%

Nickel Compounds

0.0007

0.0064

0.1

2%

94%

3%

0.4%

0%

Perchloroethylene

0.2

0.17

1.4

0.1%

12%

0%

0%

88%

1,1,2,2-Tetrachloroethane

0.1

0.017

6

0.08%

0.3%

0%

0%

100%

Chemicals with risk ratios greater than or equal to 1 are
in bold.
Risk Ratios in italics are based on noncarcinogenic effects.
The symbol ug/m3 is micrograms per cubic meter,
the amount (in micrograms) of a chemical in a cubic
meter of air. This is also known as a concentration.
* For diesel particulate matter, onroad and nonroad
concentrations include a model-estimated background
concentration.